In this update, the nbp-ansible is removed from stor4nfv repo and
all code has been merged into ansible repo. Besides, the latest
update reduce a lot of work to download and build opensds source
code. And some installation docs are also updated.
Remove license statement for the moment.
Change-Id: Ib8504d96e2d41e1c3ab7e0c94689111679d56abd
Signed-off-by: leonwang <wanghui71@huawei.com>

-This installation document assumes there is a clean Ubuntu 16.04 environment. If golang is already installed in the environment, make sure the following parameters are configured in ```/etc/profile``` and run ``source /etc/profile``:

-If use a standalone cinder as backend, you also need to install docker to run cinder service. Please see the [docker installation document](https://docs.docker.com/engine/installation/linux/docker-ce/ubuntu/) for details.

-

-### Install ansible tool

-```bash

-sudo add-apt-repository ppa:ansible/ansible # This step is needed to upgrade ansible to version 2.4.2 which is required for the ceph backend.

-sudo apt-get update

-sudo apt-get install ansible

-ansible --version # Ansible version 2.4.2 or higher is required for ceph; 2.0.0.2 or higher is needed for other backends.

+If use a standalone cinder as backend, you also need to install docker to run cinder service. Please see the [docker installation document](https://docs.docker.com/engine/installation/linux/docker-ce/ubuntu/) for details.

+

+### Install ansible tool

+To install ansible, you can run `install_ansible.sh` directly or input these commands below:

+```bash

+sudo add-apt-repository ppa:ansible/ansible # This step is needed to upgrade ansible to version 2.4.2 which is required for the ceph backend.

+sudo apt-get update

+sudo apt-get install ansible

+ansible --version # Ansible version 2.4.2 or higher is required for ceph; 2.0.0.2 or higher is needed for other backends.

+nbp_plugin_type: standalone # standalone is the default integration way, but you can change it to 'csi', 'flexvolume'

+```

+

+#### Database configuration

+Currently OpenSDS adopts `etcd` as database backend, and the default db endpoint is `localhost:2379,localhost:2380`. But to avoid some conflicts with existing environment (k8s local cluster), we suggest you change the port of etcd cluster in `group_vars/osdsdb.yml`: